docs: update postgres persistence example (#1276)

docs/docs/how-tos/index.md

@@ -25,7 +25,7 @@ LangGraph makes it easy to persist state across graph runs. The guide below show
 - [How to manage conversation history](memory/manage-conversation-history.ipynb)
 - [How to delete messages](memory/delete-messages.ipynb)
 - [How to add summary conversation memory](memory/add-summary-conversation-history.ipynb)
-- [How to create a custom checkpointer using Postgres](persistence_postgres.ipynb)
+- [How to use Postgres checkpointer for persistence](persistence_postgres.ipynb)
 - [How to create a custom checkpointer using MongoDB](persistence_mongodb.ipynb)
 - [How to create a custom checkpointer using Redis](persistence_redis.ipynb)
 

docs/docs/reference/checkpoints.md

@@ -40,4 +40,15 @@ LangGraph also natively provides the following checkpoint implementations.
 ### SqliteSaver
 
 ::: langgraph.checkpoint.sqlite.SqliteSaver
+
+### AsyncPostgresSaver
+
+::: langgraph.checkpoint.postgres.aio.AsyncPostgresSaver
+
+### PostgresSaver
+
+::: langgraph.checkpoint.postgres.PostgresSaver
+handler: python
+
+
 handler: python

docs/mkdocs.yml

@@ -134,7 +134,7 @@ nav:
           - Manage conversation history: how-tos/memory/manage-conversation-history.ipynb
           - Delete messages: how-tos/memory/delete-messages.ipynb
           - Add summary of the conversation history: how-tos/memory/add-summary-conversation-history.ipynb
-          - Create custom checkpointer using Postgres: how-tos/persistence_postgres.ipynb
+          - Use Postgres checkpointer for persistence: how-tos/persistence_postgres.ipynb
           - Create custom checkpointer using MongoDB: how-tos/persistence_mongodb.ipynb
           - Create custom checkpointer using Redis: how-tos/persistence_redis.ipynb
       - Human-in-the-loop:

poetry.lock

@@ -968,7 +968,7 @@ typing-extensions = ">=4.7"
 
 [[package]]
 name = "langgraph"
-version = "0.1.17"
+version = "0.2.2"
 description = "Building stateful, multi-actor applications with LLMs"
 optional = false
 python-versions = ">=3.9.0,<4.0"
@@ -977,6 +977,7 @@ develop = true
 
 [package.dependencies]
 langchain-core = ">=0.2.27,<0.3"
+langgraph-checkpoint = "^1.0.2"
 
 [package.source]
 type = "directory"
@@ -984,7 +985,7 @@ url = "libs/langgraph"
 
 [[package]]
 name = "langgraph-checkpoint"
-version = "1.0.0"
+version = "1.0.2"
 description = "Library with base interfaces for LangGraph checkpoint savers."
 optional = false
 python-versions = "^3.9.0,<4.0"
@@ -999,16 +1000,35 @@ type = "directory"
 url = "libs/checkpoint"
 
 [[package]]
-name = "langgraph-checkpoint-sqlite"
-version = "1.0.0"
-description = "Library with a SQLite implementation of LangGraph checkpoint saver."
+name = "langgraph-checkpoint-postgres"
+version = "1.0.1"
+description = "Library with a Postgres implementation of LangGraph checkpoint saver."
 optional = false
 python-versions = "^3.9.0,<4.0"
 files = []
 develop = true
 
+[package.dependencies]
+langgraph-checkpoint = "^1.0.1"
+orjson = ">=3.10.1"
+psycopg = {version = ">=3.1.19", extras = ["binary"]}
+
+[package.source]
+type = "directory"
+url = "libs/checkpoint-postgres"
+
+[[package]]
+name = "langgraph-checkpoint-sqlite"
+version = "1.0.0"
+description = "Library with a SQLite implementation of LangGraph checkpoint saver."
+optional = false
+python-versions = "^3.9.0"
+files = []
+develop = true
+
 [package.dependencies]
 aiosqlite = "^0.20.0"
+langgraph-checkpoint = "^1.0.1"
 
 [package.source]
 type = "directory"
@@ -1016,7 +1036,7 @@ url = "libs/checkpoint-sqlite"
 
 [[package]]
 name = "langgraph-sdk"
-version = "0.1.26"
+version = "0.1.27"
 description = "SDK for interacting with LangGraph API"
 optional = false
 python-versions = "^3.9.0,<4.0"
@@ -1852,6 +1872,92 @@ files = [
 [package.extras]
 test = ["enum34", "ipaddress", "mock", "pywin32", "wmi"]
 
+[[package]]
+name = "psycopg"
+version = "3.2.1"
+description = "PostgreSQL database adapter for Python"
+optional = false
+python-versions = ">=3.8"
+files = [
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+    {file = "psycopg-3.2.1.tar.gz", hash = "sha256:dc8da6dc8729dacacda3cc2f17d2c9397a70a66cf0d2b69c91065d60d5f00cb7"},
+]
+
+[package.dependencies]
+psycopg-binary = {version = "3.2.1", optional = true, markers = "implementation_name != \"pypy\" and extra == \"binary\""}
+typing-extensions = ">=4.4"
+tzdata = {version = "*", markers = "sys_platform == \"win32\""}
+
+[package.extras]
+binary = ["psycopg-binary (==3.2.1)"]
+c = ["psycopg-c (==3.2.1)"]
+dev = ["ast-comments (>=1.1.2)", "black (>=24.1.0)", "codespell (>=2.2)", "dnspython (>=2.1)", "flake8 (>=4.0)", "mypy (>=1.6)", "types-setuptools (>=57.4)", "wheel (>=0.37)"]
+docs = ["Sphinx (>=5.0)", "furo (==2022.6.21)", "sphinx-autobuild (>=2021.3.14)", "sphinx-autodoc-typehints (>=1.12)"]
+pool = ["psycopg-pool"]
+test = ["anyio (>=4.0)", "mypy (>=1.6)", "pproxy (>=2.7)", "pytest (>=6.2.5)", "pytest-cov (>=3.0)", "pytest-randomly (>=3.5)"]
+
+[[package]]
+name = "psycopg-binary"
+version = "3.2.1"
+description = "PostgreSQL database adapter for Python -- C optimisation distribution"
+optional = false
+python-versions = ">=3.8"
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+]
+
 [[package]]
 name = "ptyprocess"
 version = "0.7.0"
@@ -2723,4 +2829,4 @@ files = [
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.10"
-content-hash = "e55f683b5c1fc8f540cf53e9f80e180996e199250fbae54954dd7981c389fbec"
+content-hash = "8bbefefef5e786ed86783a98ff0809cfaaad26d59b2d83623c269587a3bf5f7a"

pyproject.toml

@@ -13,6 +13,7 @@ python = "^3.10"
 langgraph = { path = "libs/langgraph/", develop = true }
 langgraph-checkpoint = { path = "libs/checkpoint/", develop = true }
 langgraph-checkpoint-sqlite = { path = "libs/checkpoint-sqlite", develop = true }
+langgraph-checkpoint-postgres = { path = "libs/checkpoint-postgres", develop = true }
 langgraph-sdk = {path = "libs/sdk-py", develop = true}
 mkdocs = "^1.6.0"
 mkdocstrings = "^0.25.1"